Through her Pembroke Pines, Fla.-based company, Sandy Tavarez advises people on spring cleaning with a financial finish: garage and estate sales. Her job has many challenges, but chief among them, she says, is helping people become realistic about the dollars their belongings will fetch. In addition to designer brands and high-end finishes, fond memories and an identity-attachment that can -- in our minds -- inflate an item's value. One of her Miami customers, she remembers, donated to charity an entire Thomasville bedroom set because no one would pay the price he was demanding."Usually if something has a lot of memories or attachment, I just tell them to keep it," says Tavarez, owner of Absolute Estate Sales and Appraisals. "I'd rather have them happy than make us both look silly for trying to sell something overpriced."Spring is here, and so are our aspirations of exchanging our clutter -- or even the homes in which we store our clutter -- for cash. But while we may want to part with our T-shirts, our sofas, Gucci stilettos and the back yards in which we hosted barbeques, it's likely we'll place a higher price on what we already own than the price we'd be willing to pay for the very same things if we ourselves were on the other side of the transaction. This phenomenon happens, according to new research, because we tie our items to our identities, which we value tremendously.The attachment, though, can cost us money. Arguably, even Tavarez's customer selling his bedroom furniture would have been better off with some cash. And if you've ever spoken to homeowners carrying the costs of an overpriced property listing -- well, they tend to use expletives when describing the expenses.The good news is there are ways to erase the irrationality."Selling something feels like a loss and when buying something there's a gain," said Vanitha Swaminathan, an associate professor of marketing at University of Pittsburgh. "You might find it's hard to part with your possessions and that people won't value your things as much as you think they're worth."Behavioral researchers have long known we overvalue our stuff, but Swaminathan found the identity link by inviting a swarm of her university students into a lab. She formed three groups, giving the first one tote bags stamped with the school logo, the second group bags with a rival school's logo, and the third one bags without any logo. She ran a series of experiments, but in the most telling, students selling their school logo bags demanded $3 more than buyers wanted to pay. Students selling both plain and rival school bags demanded just over $1 what buyers would pay. On the other side, no one was willing to pay more for their school logo tote, meaning the overvaluing effect happens only when selling stuff, not buying it."Goods -- when they become part of you -- they're seen as extensions of yourself and part of your identity," Swaminathan said. "Things that become part of you are seen as more valuable."So how can you set fair prices? For garage sales, Tavarez said, label good-condition appliances, sporting equipment and designer items for about one-third of the original price. Kids clothes should sell for $2, $3 and $4, men's shirts for $3 and T-shirts for $1. For furniture, sites such as eBay -- which show the going rate -- are your best friend."Never refuse a first offer," she said. "It's usually your best."Garage sale safetyGarage sales are great for making some money, but they also leave you vulnerable.Garage sale expert Sandy Tavarez reminds you to:•Always have more than one person -- three people are ideal -- helping you with customers.Never agree to go back inside your home and bring out additional items such as jewelry or perfume. Those people are plotting something. Tell them items for sale are all displayed.Don't take bills higher than $20.Have lots of $1 bills on hand.Go inside and put away your earnings every time they total $150.Garage sale permitsThe rules vary across cities and towns, but here are some garage sale standards most of us must follow:•You can only sell secondhand goods.You must own those goods -- no consignment sales.Hours of the sale must be during daytime, though exact hours will vary.Items must be displayed within property lines.You might need additional permits for firearms, electronics or automobiles.You might be allowed a limited number of yard sales a year before being considered a retailer and required to collect sales taxes.Signs advertising the sale will be limited.Parking cannot block traffic.

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